Time now for the "instant index" on this christmas eve. And we start with our person. A quick-thinking boston cop who saved a woman in real trouble. It all played out in this cell phone video. Officer ed ward norton jumping into freezing waters after he spotted a woman that had fallen in. As you look at this, bear in mind, the officer was weighed down the whole time by his bullet proof vest. She kept saying stuff like, you know, I can't hold on, i can't hold on. She did hold on and they got out of there safely. There is an interesting postscript for the officer. After getting out of the cold water, he got into some hot water with his wife. He lost his wedding ring during the rescue. Now, to a moment that one family is calling the best christmas present ever. It happened at the airport in phoenix, arizona, and it's our video of the day. You are looking at cassandra's family reuniting with their dog, kane, who had been missing for nine months. They gave up hope, but out of nowhere, they got a call this weekend that kane was found walking along a road in oregon, more than 1,000 hides from his home. He was identified by a microchip that had been implanted and set back home. Finally, our number, as we track santa's journey tonight. 1.7 billion. That's how many presents are loaded onto santa's sleigh. The team at norad has been tracking santa since his sleigh took off from the north pole earlier today. They are using radar, satellites, fighter jets, even santa cams. Google is tracking santa, as well. They say santa generally arrives in most countries between 9:00 p.M. And midnight, but the kids have to be asleep or he will leave and come back later. We're always looking for cool stuff with the index. If you see something you like, hit me on twitter @danbhalf ris. Coming up next, the

This transcript has been automatically generated and may not be 100% accurate.

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